Select the method for the auto segmentation: Method – sets the method of mapping.

• Normal Mapping – method of mapping applies planar maps based on directional procedures. It is the simplest method, but can result in greater texture distortion.
• Flatten Mapping – method of mapping applies planar maps to contiguous polygons that are within a specified angle threshold. It prevents overlap of mapping clusters, but can still cause texture distortion. The Flatten Mapping dialog lets you control how clusters are defined and mapped.